The major axis of an ellipse is its longest diameter, a line that runs through the center and both foci, its ends being at the widest points of the shape.
The semi-major axis is one half of the major axis, and thus runs from the centre, through a focus, and to the edge of the ellipse. It represents a "long radius" of the ellipse, and is the "average" distance of an orbiting planet or moon from its parent body.
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The distance from one of the foci to the center of the ellipse divided by the eccentricity.
The horizontal axis is also known as the 'X' axis. The vertical axis is also known as the 'Y' axis.
It is also known as the x-axis.
The Y-axis is also known as the Ordinate, while the X-axis is known as the Abscissa.
the horizontal axis is known as the x axis
The value that you manipulate (change) goes on the x-axis. This is also known as the independent variable. :)